Hey all I'm coming from using hd428s for a while now and just bought the denon d600 the other day. I love the way they sound but I had to tweak the EQ settings a bit. I've been doing a lot of reading on being able to power headphones to their max potential and it brings me to this series of questions. I currently use an iPhone 6 for my music. I have no other media player. I've been browsing around and I see the fiiO series X1, X3 and X5. I've also seen the Sansa clip mentioned as well as all the iPod lines, mainly the ones that can be rock boxed. Any suggestions on what I should get? I listen to a lot of rock, Billy Talent, Iron Maiden, toward the darker stuff, also listen to Andrea Bocelli, Nightwish, lots of orchestrated metal, as well as house/dance music. I guess everything, to be honest. Not sure if I would need a small amp with the X5 but I imagine I would benefit from one of I went with the X1 or X3. Maybe I don't need a dedicated player and I could just use my phone or get an iPod and call it a day? I would rather not use my phone for a media player due to these batteries going down in the dumps quickly. Any input is greatly appreciated. If I had to lean toward a certain genre, I would say Nightwish style orchestrated metal, symphonic music. Not sure that it would make a difference. I'm leaning toward the X5 with the E11K amp.